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<FONT color="green">001</FONT>    package maze.model;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.io.Serializable;<a name="line.3"></a>
<FONT color="green">004</FONT>    import java.util.ArrayList;<a name="line.4"></a>
<FONT color="green">005</FONT>    import java.util.Collections;<a name="line.5"></a>
<FONT color="green">006</FONT>    import java.util.HashSet;<a name="line.6"></a>
<FONT color="green">007</FONT>    import java.util.List;<a name="line.7"></a>
<FONT color="green">008</FONT>    import java.util.Set;<a name="line.8"></a>
<FONT color="green">009</FONT>    <a name="line.9"></a>
<FONT color="green">010</FONT>    import maze.util.ListenerSubject;<a name="line.10"></a>
<FONT color="green">011</FONT>    <a name="line.11"></a>
<FONT color="green">012</FONT>    /**<a name="line.12"></a>
<FONT color="green">013</FONT>     * This model class stores a bunch of information about the robots path through<a name="line.13"></a>
<FONT color="green">014</FONT>     * the maze. Like which cells have been visited, and what the current, best, and<a name="line.14"></a>
<FONT color="green">015</FONT>     * first paths are.<a name="line.15"></a>
<FONT color="green">016</FONT>     * @author Luke Last<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    public final class RobotPathModel extends ListenerSubject&lt;MazeCell&gt; implements Serializable<a name="line.18"></a>
<FONT color="green">019</FONT>    {<a name="line.19"></a>
<FONT color="green">020</FONT>       private final Set&lt;MazeCell&gt; visited = new HashSet&lt;MazeCell&gt;(128);<a name="line.20"></a>
<FONT color="green">021</FONT>       private final List&lt;MazeCell&gt; pathCurrent = new ArrayList&lt;MazeCell&gt;(128);<a name="line.21"></a>
<FONT color="green">022</FONT>       private final List&lt;MazeCell&gt; pathFirst = new ArrayList&lt;MazeCell&gt;(128);<a name="line.22"></a>
<FONT color="green">023</FONT>       final List&lt;MazeCell&gt; pathBest = new ArrayList&lt;MazeCell&gt;(128);<a name="line.23"></a>
<FONT color="green">024</FONT>       private final MazeCell startCell;<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>       /**<a name="line.26"></a>
<FONT color="green">027</FONT>        * Constructor.<a name="line.27"></a>
<FONT color="green">028</FONT>        * @param startingCell The cell that should be considered to be the starting<a name="line.28"></a>
<FONT color="green">029</FONT>        *           point of the maze. This is used to determine the recent path<a name="line.29"></a>
<FONT color="green">030</FONT>        *           since hitting the starting cell.<a name="line.30"></a>
<FONT color="green">031</FONT>        */<a name="line.31"></a>
<FONT color="green">032</FONT>       public RobotPathModel(MazeCell startingCell)<a name="line.32"></a>
<FONT color="green">033</FONT>       {<a name="line.33"></a>
<FONT color="green">034</FONT>          if (startingCell == null)<a name="line.34"></a>
<FONT color="green">035</FONT>             throw new IllegalArgumentException("Starting cell cannot be null.");<a name="line.35"></a>
<FONT color="green">036</FONT>          this.startCell = startingCell;<a name="line.36"></a>
<FONT color="green">037</FONT>       }<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>       /**<a name="line.39"></a>
<FONT color="green">040</FONT>        * Add a new visited cell to the path storage model.<a name="line.40"></a>
<FONT color="green">041</FONT>        * @param cell The cell that has just been visited.<a name="line.41"></a>
<FONT color="green">042</FONT>        */<a name="line.42"></a>
<FONT color="green">043</FONT>       public void addLocation(MazeCell cell)<a name="line.43"></a>
<FONT color="green">044</FONT>       {<a name="line.44"></a>
<FONT color="green">045</FONT>          this.visited.add(cell);<a name="line.45"></a>
<FONT color="green">046</FONT>          this.pathCurrent.add(cell);<a name="line.46"></a>
<FONT color="green">047</FONT>          // Notify listeners that this cell has been changed.<a name="line.47"></a>
<FONT color="green">048</FONT>          super.notifyListeners(cell);<a name="line.48"></a>
<FONT color="green">049</FONT>          // Also signal that the north and west walls may need to be repainted.<a name="line.49"></a>
<FONT color="green">050</FONT>          if (cell.getX() &gt; 1)<a name="line.50"></a>
<FONT color="green">051</FONT>          {<a name="line.51"></a>
<FONT color="green">052</FONT>             super.notifyListeners(cell.plusX(-1));<a name="line.52"></a>
<FONT color="green">053</FONT>          }<a name="line.53"></a>
<FONT color="green">054</FONT>          if (cell.getY() &gt; 1)<a name="line.54"></a>
<FONT color="green">055</FONT>          {<a name="line.55"></a>
<FONT color="green">056</FONT>             super.notifyListeners(cell.plusY(-1));<a name="line.56"></a>
<FONT color="green">057</FONT>          }<a name="line.57"></a>
<FONT color="green">058</FONT>       }<a name="line.58"></a>
<FONT color="green">059</FONT>    <a name="line.59"></a>
<FONT color="green">060</FONT>       public boolean hasCellBeenVisited(MazeCell cell)<a name="line.60"></a>
<FONT color="green">061</FONT>       {<a name="line.61"></a>
<FONT color="green">062</FONT>          return this.visited.contains(cell);<a name="line.62"></a>
<FONT color="green">063</FONT>       }<a name="line.63"></a>
<FONT color="green">064</FONT>    <a name="line.64"></a>
<FONT color="green">065</FONT>       /**<a name="line.65"></a>
<FONT color="green">066</FONT>        * Get the most recent path the robot has taken since the last time it<a name="line.66"></a>
<FONT color="green">067</FONT>        * visited the starting cell.<a name="line.67"></a>
<FONT color="green">068</FONT>        * @return An in order list of the robots most recent path.<a name="line.68"></a>
<FONT color="green">069</FONT>        */<a name="line.69"></a>
<FONT color="green">070</FONT>       public List&lt;MazeCell&gt; getPathRecent()<a name="line.70"></a>
<FONT color="green">071</FONT>       {<a name="line.71"></a>
<FONT color="green">072</FONT>          //TODO This whole thing is slow.<a name="line.72"></a>
<FONT color="green">073</FONT>    <a name="line.73"></a>
<FONT color="green">074</FONT>          if (this.pathCurrent.isEmpty() ||<a name="line.74"></a>
<FONT color="green">075</FONT>              this.startCell.equals(this.pathCurrent.get(this.pathCurrent.size() - 1)))<a name="line.75"></a>
<FONT color="green">076</FONT>          {<a name="line.76"></a>
<FONT color="green">077</FONT>             return Collections.emptyList();<a name="line.77"></a>
<FONT color="green">078</FONT>          }<a name="line.78"></a>
<FONT color="green">079</FONT>          final ArrayList&lt;MazeCell&gt; currentRun = new ArrayList&lt;MazeCell&gt;();<a name="line.79"></a>
<FONT color="green">080</FONT>          for (int i = this.pathCurrent.lastIndexOf(this.startCell); i &lt; this.pathCurrent.size(); i++)<a name="line.80"></a>
<FONT color="green">081</FONT>          {<a name="line.81"></a>
<FONT color="green">082</FONT>             currentRun.add(this.pathCurrent.get(i));<a name="line.82"></a>
<FONT color="green">083</FONT>          }<a name="line.83"></a>
<FONT color="green">084</FONT>          return Collections.unmodifiableList(currentRun);<a name="line.84"></a>
<FONT color="green">085</FONT>       }<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>       /**<a name="line.87"></a>
<FONT color="green">088</FONT>        * Gets the entire current path from the very beginning.<a name="line.88"></a>
<FONT color="green">089</FONT>        * @return An in order list of the total path taken by the robot. The List is<a name="line.89"></a>
<FONT color="green">090</FONT>        *         read only.<a name="line.90"></a>
<FONT color="green">091</FONT>        */<a name="line.91"></a>
<FONT color="green">092</FONT>       public List&lt;MazeCell&gt; getPathCurrent()<a name="line.92"></a>
<FONT color="green">093</FONT>       {<a name="line.93"></a>
<FONT color="green">094</FONT>          return Collections.unmodifiableList(this.pathCurrent);<a name="line.94"></a>
<FONT color="green">095</FONT>       }<a name="line.95"></a>
<FONT color="green">096</FONT>    <a name="line.96"></a>
<FONT color="green">097</FONT>       /**<a name="line.97"></a>
<FONT color="green">098</FONT>        * Get the first path taken from the start to the center.<a name="line.98"></a>
<FONT color="green">099</FONT>        * @return Ordered list of cells.<a name="line.99"></a>
<FONT color="green">100</FONT>        */<a name="line.100"></a>
<FONT color="green">101</FONT>       public List&lt;MazeCell&gt; getPathFirst()<a name="line.101"></a>
<FONT color="green">102</FONT>       {<a name="line.102"></a>
<FONT color="green">103</FONT>          return this.pathFirst;<a name="line.103"></a>
<FONT color="green">104</FONT>       }<a name="line.104"></a>
<FONT color="green">105</FONT>    <a name="line.105"></a>
<FONT color="green">106</FONT>       /**<a name="line.106"></a>
<FONT color="green">107</FONT>        * Get the best run that consists of the least number of cells to get from<a name="line.107"></a>
<FONT color="green">108</FONT>        * the start to the finish.<a name="line.108"></a>
<FONT color="green">109</FONT>        * @return Ordered list of cells.<a name="line.109"></a>
<FONT color="green">110</FONT>        */<a name="line.110"></a>
<FONT color="green">111</FONT>       public List&lt;MazeCell&gt; getPathBest()<a name="line.111"></a>
<FONT color="green">112</FONT>       {<a name="line.112"></a>
<FONT color="green">113</FONT>          return this.pathBest;<a name="line.113"></a>
<FONT color="green">114</FONT>       }<a name="line.114"></a>
<FONT color="green">115</FONT>    <a name="line.115"></a>
<FONT color="green">116</FONT>       /**<a name="line.116"></a>
<FONT color="green">117</FONT>        * Get the total number of cells that have been visited.<a name="line.117"></a>
<FONT color="green">118</FONT>        * @return Number of cells.<a name="line.118"></a>
<FONT color="green">119</FONT>        */<a name="line.119"></a>
<FONT color="green">120</FONT>       public int getCellsVisited()<a name="line.120"></a>
<FONT color="green">121</FONT>       {<a name="line.121"></a>
<FONT color="green">122</FONT>          return this.visited.size();<a name="line.122"></a>
<FONT color="green">123</FONT>       }<a name="line.123"></a>
<FONT color="green">124</FONT>    }<a name="line.124"></a>




























































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